Universal joint arrangement between an apparatus holder and a support arm or a console

ABSTRACT

In a universal joint arrangement between an apparatus holder and an apparatus support console including a receiver element mounted to the console, a ball joint element projecting from the holder, a ball element for engaging the ball joint element and the receiver element and a clamping mechanism comprising a bolt and a nut, the bolt extends through the ball joint element and the receiver element and the nut or the bolt head is retained in an operating wheel which is disposed adjacent the receiver element so as to be rotatable by the fingers of a user for adjusting the clamping force engaging the ball joint element between the receiver element and the ball element.

BACKGROUND OF THE INVENTION

The invention relates to a universal joint arrangement for the interconnection of an apparatus holder or an apparatus holder mounting plate or a similar device and a support arm or a support console.

Mobile apparatus such as minicomputers, so-called PDA's (Personal Digital Assistants) navigation apparatus, mobile telephones and similar apparatus are used in motor vehicles, on desks or at other locations in connection with apparatus carriers which include a console or a support arm, to which an apparatus holder or a mounting plate for supporting an apparatus holder is connected by way of a joint structure so that the respective apparatus can be adjusted to a position which is convenient for the observation of the visual display of the apparatus and for the operation of the apparatus.

Universal joints for that purpose are known in the form of two adjacent hinge joints oriented so as to be pivotable in rectangularly displaced planes and also in the form of ball joints with spherical segment-shaped joint parts. In order to hold a particular apparatus stable in a selected position, it is of course necessary that the joint mechanism can be locked or that it is pretensioned so as to provide for sufficient friction between the joint parts to hold the joint parts in a particular selected position. In known ball joint mechanisms, the required clamping tension is generated in that a screw is screwed from the mounting plate that is from the side of the apparatus into the seating area of the joint mechanism and tightened to the degree needed to engage the joint parts. However, since the joint parts all consist essentially of plastic material which has a heat expansion coefficient different from the engagement means substantial problems have been encountered particularly in connection with the use of such joints in motor vehicles because of the high temperature changes for example as a result of the heating of vehicles parked in the summertime in the sun. Then, it has been found that the clamping tension becomes so relaxed that the apparatus holder will no longer maintain the adjusted position. This can be not only very annoying because it makes the use of the apparatus difficult but also because the necessary tensioning can be performed only with the use of a fitting screw driver and this process is often possible only by the removal of the apparatus holder or even additionally the mounting plate. Furthermore, upon cool-down, the joint may be so tight that it can no longer be adjusted.

It is therefore the object of the present invention to provide an arrangement by which the problem described above can be controlled easily and without complicated design features.

SUMMARY OF THE INVENTION

In a universal joint arrangement between an apparatus holder and an apparatus support console including a receiver element mounted to the console, a ball joint element projecting from the holder, a ball element for engaging the ball joint element and the receiver element and a clamping mechanism comprising a bolt and a nut, the bolt extends through the ball joint element and the receiver element and the nut or the bolt head is retained in an operating wheel which is disposed adjacent the receiver element so as to be rotatable by the fingers of a user for adjusting the clamping force engaging the ball joint element between the receiver element and the ball element.

A particular preferred embodiment of the invention will be described below on the basis of the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of the ball joint arrangement according to the invention,

FIG. 2 shows the ball joint arrangement according to the invention in an axial cross-sectional view, and

FIG. 3 shows an exemplary application for a ball joint arrangement according to the invention.

DETAILED DESCRIPTION OF AN EMBODIMENT

FIGS. 1 and 2 show the joint arrangement according to the invention in connection with an apparatus support plate 1 and a short pivot arm 2 which is the end member of an apparatus carrier which is not shown. The apparatus support plate 1 has angled claws 11 which cooperate with corresponding engagement slots of an apparatus holder which is not shown and, together therewith, form a rapid coupling structure for releasably mounting the apparatus holder. The pivot arm 2, which is shown very short in the figure may of course have any length and, at its rear end, is provided with a forked hinge element 21 which cooperates with a corresponding counter element of a pivot hinge mechanism.

As shown in the side view of FIG. 1 and the cross-sectional view of FIG. 2 (in a plane turned by 90°), the ball joint arrangement between the apparatus mounting plate 1 and the pivot arm 2 consists of a ball joint element 12 disposed on the backside of the mounting plate 1, a ball joint receiver 22 disposed at the front end of the pivot arm 2 and a joint clamping mechanism 3.

The joint clamping mechanism 3 comprises a sleeve member 31 projecting from the ball segment receiver 22, a spherical segment-shaped clamping body 32 disposed on the free end of the sleeve member 31, a bolt 33 extending from the clamping body 32 through the sleeve member 31 and having a head snugly received in a correspondingly shaped recess of the clamping body 32 so as to be held rotationally fixed thereby and a nut 35 threaded onto the bolt 33 behind the ball segment receiver 22 with an adjustment wheel 36 snugly receiving the nut 35 for rotation therewith. As shown in FIGS. 1 and 2, the pivot arm 2 has adjacent the segment receiver 22 a cylindrical recess 2′ in which the end of the bolt 33 is accommodated and the clamping body 32 has a recess 32′ (FIG. 2) which receives the free end of the sleeve member 31 so as to permit a relative axial movement between the clamping body 32 and the sleeve member 31 over a certain distance.

The ball joint element 12 is therefore received between the segment receiver 22 and the clamping body 32 and is engageable therebetween. As apparent from FIG. 2, the ball joint element 12 has a large central opening 13 through which the sleeve member 31 extends and whose size is so selected that the desired freedom of pivoting of the mounting plate 1 over a certain range is made possible.

By rotating the adjustment wheel 36 which is preferably knurled at its circumference, the ball joint arrangement can be tightened or loosened any time while the apparatus holder is mounted onto the mounting plate 1 and this can be done without the use of any tools.

As apparent particularly from FIG. 1, the adjustment wheel 36 is arranged within a flat frame structure formed by the pivot arm 2 so that it can be easily grasped with two fingers. Of course, the pivot arm 2 may have any desirable shape or may be replaced by another member of an apparatus support structure.

As an actual example of an application, FIG. 3 shows a complete apparatus carrier 4 with a column 41, a suction foot 42 with an operating mechanism therefore arranged within the column 41 and a telescopic arm 44 connected thereto by a hinge joint structure 43 having two hinge axes displaced by 90° and carrying at the free end thereof the apparatus support plate 1 by way of the clamping mechanism 3 described above.

Other than described in the shown example, the ball joint structure may also have a clamping mechanism in which the adjustment wheel 36 is connected to the head of a bolt cooperating with a nut received in the clamping body 32. 

1. A universal joint arrangement (12, 22, 32) between an apparatus holder (1) and an apparatus support console (4) comprising: a receiver element (22) mounted to one end of the console (4), a ball joint element (32) projecting from the holder (1), a ball element (32) for engaging the ball joint element (32) and the receiver element (22) and the receiver element (22) and a clamping mechanism (3) comprising a bolt (33) and nut (35) of which one is mounted to the ball element (32) and the other provides an engagement force for engaging the ball joint element (12) between the receiver element (22) and the ball element (32), said bolt (33) extending through the ball joint element (12) and the receiver element (22) with one of the bolt (33) and the nut (35) being engaged with the ball element (32) and the other of the bolt (33) and the nut (35) being supported and retained in an operating wheel (36) which is disposed adjacent the receiver element (22) so as to be finger rotatable for adjusting the clamping force engaging the ball joint (12) between the receiver element (22) and the ball element (32).
 2. An arrangement according to claim 1, wherein the receiver element (22) is a bowl-shaped member and the ball joint element (12) is received in the bowl-shaped member and has a center opening (13) through which the bolt (33) passes and which is sufficiently large to provide a desired pivot range for the holder (1) on the support console (4).
 3. An arrangement according to claim 2, wherein the receiver element (22) includes an axially projecting sleeve (31) receiving the bolt (33) and the ball element (32) has a recess (32′) receiving an end portion of the axially projecting sleeve (31) for axially movably guiding the ball element (32).
 4. An arrangement according to claim 1, wherein the bolt (33, 34) is firmly connected to the ball element (32) and the nut (35) is mounted for rotation with the nut (35) threaded onto the bolt (33).
 5. An arrangement according to claim 4, wherein the bolt has a bolt head (34) which is snugly engaged in the ball element (32) so as to be rotationally fixed therewith. 